Sayfullo Saipov cooked up terror scheme a year ago and wanted ISIS flag flown in hospital

Sayfullo Saipov, 29, was determined to wreak as much havoc as he could, circling Halloween on his calendar because he knew more people would be out and about.

The man behind the wheel of a rented truck that cut a path of destruction along a lower Manhattan bike path planned on continuing to the Brooklyn Bridge after the West Side highway and "wanted to kill as many people as he could," according to court papers.

Sayfullo Saipov, 29, was so determined to wreak the maximum amount of havoc that he circled Halloween on his calendar because he knew more people would be out and about.

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Saipov appeared before Magistrate Judge Barbara Moses, and was charged with providing material support to a terrorist group and violence and destruction of motor vehicles.

Sayfullo Saipov, the suspect in the Lower Manhattan truck attack, is seen in this courtroom sketch appearing in Manhattan federal courtroom in a wheelchair. (JANE ROSENBERG/REUTERS)

A weak-looking Saipov wore gray sweats, and was pushed into Manhattan Federal Court in a wheelchair, where he wore an earpiece and communicated with a Russian translator.

He was handcuffed and his feet were shackled.

After Saipov was shot and subdued, police recovered two cellphones and a stun gun on the floor of the truck. One of the phones contained nearly 90 videos, most of which contained ISIS propaganda. (James Keivom/New York Daily News)

Prosecutors, in documents formally charging Saipov with the deaths of eight people in an attack that left more than a dozen wounded, said Saipov had even rented a truck weeks before, and was even practicing making turns to get a feel for how the vehicle handled.

The practice run was part of an elaborate plan that was in effect for more than a year, according to court papers.

Terrorist kills 8, wounds 11 in Lower Manhattan truck rampage

"The truck then drove down the walkway for several blocks and struck numerous civilians on the walkway. The truck eventually collided with a school bus, which was carrying occupants in the vicinity of West Street and Chambers Street."

"Saipov rented the truck from the store for a period of two hours but had no intention of ever returning it," the criminal complaint said.